Sorta has recently switched back to the iPhone and bought an iPhone XR. I still had my 2015 S0 Apple Watch, and I've used it but can't help but notice it's been very slow. I want to upgrade and have considered a used S2, but would this be too old? My budget is flexible, but my max will be around $ 200. I just need the clock to be swim safe, so Series 1 is out of the question and I don't care about LTE. Thanks!